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mp3 , 6 hours ago Tech Alert | Windows crashes related to Falcon Sensor | 2024-07-19 Published Date: Jul 19, 2024 Summary CrowdStrike is aware of reports of crashes on Windows hosts related to the Falcon Sensor. Details Symptoms include hosts experiencing a bugcheck\blue screen error related to the Falcon Sensor. Windows hosts which have not been impacted do not require any action as the problematic channel file has been reverted. Windows hosts which are brought online after 0527 UTC will also not be impacted Hosts running Windows7/2008 R2 are not impacted. This issue is not impacting Mac- or Linux-based hosts Channel file “C-00000291.sys” with timestamp of 0527 UTC or later is the reverted (good) version.* Channel file “C-00000291.sys” with timestamp of 0409 UTC is the problematic version.* Current Action CrowdStrike Engineering has identified a content deployment related to this issue and reverted those changes. If hosts are still crashing and unable to stay online to receive the Channel File Changes, the following steps can be used to workaround this issue: Workaround Steps for individual hosts: Reboot the host to give it an opportunity to download the reverted channel file. If the host crashes again, then: Boot Windows into Safe Mode or the Windows Recovery Environment Note: Putting the host on a wired network (as opposed to WiFi) and using Safe Mode with Networking can help remediation. Navigate to the %WINDIR%\System32\drivers\CrowdStrike directory Locate the file matching “C-00000291*.sys”, and delete it. Boot the host normally. Note: Bitlocker-encrypted hosts may require a recovery key. Workaround Steps for public cloud or similar environment including virtual: Option 1: Detach the operating system disk volume from the impacted virtual server Create a snapshot or backup of the disk volume before proceeding further as a precaution against unintended changes Attach/mount the volume to to a new virtual server Navigate to the %WINDIR%\System32\drivers\CrowdStrike directory Locate the file matching “C-00000291*.sys”, and delete it. Detach the volume from the new virtual server Reattach the fixed volume to the impacted virtual server Option 2: Roll back to a snapshot before 0409 UTC. AWS-specific documentation: To attach an EBS volume to an instance Detach an Amazon EBS volume from an instance Azure environments: Please see this Microsoft article. Bitlocker recovery-related KBs: BitLocker recovery in Microsoft Azure BitLocker recovery in Microsoft environments using SCCM BitLocker recovery in Microsoft environments using Active Directory and GPOs BitLocker recovery in Microsoft environments using Ivanti Endpoint Manager BitLocker recovery in Microsoft environments using ManageEngine Desktop Central Latest Updates 2024-07-19 05:30 AM UTC | Tech Alert Published. 2024-07-19 06:30 AM UTC | Updated and added workaround details. 2024-07-19 08:08 AM UTC | Updated 2024-07-19 09:45 AM UTC | Updated 2024-07-19 11:49 AM UTC | Updated 2024-07-19 11:55 AM UTC | Updated Support Find answers and contact Support with our Support Portal
Published Date: Jul 19, 2024
Boot Windows into Safe Mode or the Windows Recovery Environment
Navigate to the %WINDIR%\System32\drivers\CrowdStrike directory
Locate the file matching “C-00000291*.sys”, and delete it.
Boot the host normally.
Note: Bitlocker-encrypted hosts may require a recovery key.
Option 1:
Option 2:
Azure environments:
Please see this Microsoft article.
Bitlocker recovery-related KBs:
Latest Updates